.loader{animation:1s infinite l18;box-shadow:-20px 0,20px 0}@keyframes l18{25%{box-shadow:-20px -20px,20px 20px}50%{box-shadow:0 -20px,0 20px}75%{box-shadow:20px -20px,-20px 20px}to{box-shadow:20px 0,-20px 0}}